نتایج جستجو برای: sand desert metaphor
تعداد نتایج: 54821 فیلتر نتایج به سال:
The complex, relative dielectric permittivity " of dry desert sand, collected at the Grand Erg Oriental in Ksar Ghilane, Tunisia, in October 1994, was measured with microwave resonators at frequencies between 0.245 and 6 GHz. The results are presented here. Whereas the real part "0 is nearly independent of frequency, a monotonous decrease of the imaginary part "00 with increasing frequency is o...
Introduction Sand ramp is a kind of sand dune located on or in the foot of some mountains slopes of arid and semi-arid regions. Although these landforms does not differ from other types of sand dunes in these areas apparently, but, there are significant differences between them from the point of view of slope, sediment grain size, Morphology, sediment homogeneous, stratigraphy, laminatio...
Abstract For sustainable development, sand-mixed concrete has been paid more and attention by researchers. In order to study the mechanical properties of sand-gravel concrete, five temperature levels natural cooling water were considered, sand-stone after high tested.. desert sand temperature, this paper designs a single factor test with replacement rate as variable. Five are watering adopted t...
A vast area of Iran is covered by sand dunes. Biological control is an appropriate method for sand dune fixation. So, it is essential to recognize characteristics of psammophyte plant species and introducing suitable species for sand dunes. Ammodendron persicum is one of the important and compatible species in desert ecosystems. The current research was carried out to investigate the effect of ...
The most recent Cassini RADAR images of Titan show widespread regions (up to 1500 kilometers by 200 kilometers) of near-parallel radar-dark linear features that appear to be seas of longitudinal dunes similar to those seen in the Namib desert on Earth. The Ku-band (2.17-centimeter wavelength) images show approximately 100-meter ridges consistent with duneforms and reveal flow interactions with ...
BACKGROUND The ostrich is a cursorial bird with extraordinary speed and endurance, especially in the desert, and thus is an ideal large-scale animal model for mechanic study of locomotion on granular substrate. METHODS The plantar pressure distributions of ostriches walking/running on loose sand/solid ground were recorded using a dynamic pressure plate. RESULTS The center of pressure (COP) ...
Introduction Yueya Spring, or Crescent Moon Spring, is a geological wonder located about 6 km south of Dunhuang city, Gansu Province, northwest China. It owes its name to the shape of the spring, or more precisely, the pond fed by the spring water, which resembles a Crescent Moon (Figure 1). Currently, the pond is about 200 m long in an east-west direction and about 50 m wide. The water surface...
Coastal and inland dune sands in desert environments are compositionally and texturally controlled by physical and chemical processes such as the wind action, marine/fluvial processes, weathering, air temperature and precipitation. The objectives of this research are study of sedimentological characteristics, calculation of CIA in the Aeolian sediments and classification of sand dunes in the Ya...
Booming” sand dunes have a remarkable capacity to produce sounds that are comparable with those from a stringed instrument. This phenomenon, in which sound is generated after an avalanching of sand along the slip face of a dune, has been known for centuries and occurs in at least 40 sites around the world. A spectral analysis of the sound shows a dominant frequency between 70 and 110 Hz, as wel...
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